Add custom delimiter option

[kamikazechaser]

Users can now choose "sane" delimiter options such as:
"~", "+", "/", "#", among others.

Sticking with old ES5 syntax for forming strings.

Regex limits delimiters to certain sane delimiter values i.e. https://en.wikipedia.org/wiki/Delimiter-separated_values

Defaults to "-"

I think project is kinda old but we can add a tiny feature to it, probably not very useful though.

[kamikazechaser]

MFW i didn't see PR #2. FFS.

[kamikazechaser]

I guess the string padding at at the ends of the delimiter should be removed.

i.e " / " should be "/"

so the ids become "AA/001" instead of "AA / 001"

Though it should default to " - " as the project initially intended.